To mark is to: make a mark on an object, correct or improve a piece of work (school), or to say close to an opposition player (sports)
Past Participle form
I mark maths books every day.
When playing football, I always mark the striker.
A: What are you doing this weekend?
B: I should mark the books but I really don't want to.
A: Why not?
B: It's a little boring.
I marked our position on the map.
She marked the essays that the children wrote.
A: Did you mark the page you were reading?
B: I marked it with a book mark.
A: Well done.
I'm marking the books now.
Ramos is marking Messi.
A: Who's doing what?
B: I'm marking where the wood needs to be cut.
C: I'm going to cut the wood.
D: I'm going to sand it afterwards.
I had marked all the books before 5pm! Well done me.
Your son has marked that tree with red paint. That is very irresponsible.
A: Have you marked anyone in Basketball before?
B: Never. What do I do?
A: Stay close to them when they are in our half of the court.